51199998 has 8 divisors (see below), whose sum is σ = 102400008. Its totient is φ = 17066664.

The previous prime is 51199991. The next prime is 51200027. The reversal of 51199998 is 89999115.

It is a sphenic number, since it is the product of 3 distinct primes.

51199998 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 51199998.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51199991) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4266661 + ... + 4266672.

It is an arithmetic number, because the mean of its divisors is an integer number (12800001).

Almost surely, 2^51199998 is an apocalyptic number.

51199998 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51199998 is a wasteful number, since it uses less digits than its factorization.

51199998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8533338.

The product of its digits is 262440, while the sum is 51.

The square root of 51199998 is about 7155.4173882451. The cubic root of 51199998 is about 371.3271018540.

The spelling of 51199998 in words is "fifty-one million, one hundred ninety-nine thousand, nine hundred ninety-eight".